I used Smooth-On brand rubbers and plastics and followed their very helpful tutorial videos. The main hiccup was finding the right area on the model to make the seam so that I could easily remove the mold without damaging the mold or the original. To see the piece I molded in better detail, click here. I ended losing about half of the original's hair, its ear, a leech on the shoulder, and the tip of the breathing apparatus. With a couple of carefully placed cuts in the mold I'm now able to get replicates that are completely intact without leaving bits in the mold (it also helps that the resin is less brittle than the original's sculpey form).
I used a quick-cure formula in my first attempt, and the resin started setting as I was pouring it into the mold. The catalyzed reaction burnt my fingers even through my glove so I dropped the melted cup on my desk which is now a warped mess. The picture above shows my second try which I went into much better prepared. The finished result unfortunately has a lot of bubbles, but every cast I do I learn more about the process.
Now I can paint copies and give/sell them to people. I'll add more pictures to this post once I've put a base coat of paint on so that the details are visible rather than transparent.
If anybody wants a monster to paint I'll happily make you a copy :-)
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